Grape juice was mixed with red rose extract; the mixture got a tint of red colour. What will happen if baking soda is added to this mixture? Justify your answer.
When baking soda is added to the mixture, the colour will change from red to green.
The red colour of the mixture indicates that grape juice is acidic in nature, as red rose extract gives red colour in acidic solutions.
Baking soda is a basic substance. When added to the acidic mixture, it will neutralise the acid.
As more baking soda is added and the solution becomes basic, the red rose extract will change colour from red to green, indicating the change from acidic to basic nature.
Explanation
The chapter explains that red rose extract gives red colour in acidic solutions and green colour in basic solutions. Grape juice is acidic, causing the red colour. Baking soda (sodium bicarbonate) is basic. When a base is added to an acidic solution, neutralisation occurs. As the solution transitions from acidic to basic due to excess baking soda, the indicator colour changes from red to green.
Solution Steps
The mixture appears red because grape juice is acidic, and red rose extract gives red colour in acidic solutions.
Baking soda is a basic substance.
When baking soda is added to the acidic mixture, neutralisation occurs.
As the solution transitions from acidic to basic due to excess baking soda, the indicator colour changes from red to green.